Sound signal processing device, mobile apparatus, method, and program

Abstract

A sound signal processing device performs sound field control by controlling each virtual sound source position of a primary sound source and an ambient sound source that are separated sound signals obtained from an input sound source, in accordance with changes in velocity and traveling direction of an automobile. The sound signal processing device includes: a velocity information acquisition unit that acquires velocity information about a mobile apparatus; a steering information acquisition unit that acquires steering information about the mobile apparatus; and a sound control unit that controls output sounds from speakers disposed at a plurality of different positions in the mobile apparatus. The sound control unit performs sound field control by controlling the respective virtual sound source positions of the primary sound source and the ambient sound source that are separated sound signals obtained from the input sound source, in accordance with the velocity information and the steering information.

1 . A sound signal processing device comprising:
 a behavior information acquisition unit that acquires behavior information about a mobile apparatus; and   a sound control unit that controls output sounds from speakers disposed at a plurality of different positions in the mobile apparatus,   wherein the sound control unit performs sound field control by controlling a virtual sound source position of each separated sound signal obtained from an input sound source, in accordance with information acquired by the behavior information acquisition unit.   
     
     
         2 . The sound signal processing device according to  claim 1 , wherein
 the behavior information acquisition unit is a velocity information acquisition unit that acquires velocity information about the mobile apparatus, and   the sound control unit performs sound field control by controlling the virtual sound source positions of the respective separated sound signals obtained from the input sound source, in accordance with the velocity information acquired by the velocity information acquisition unit.   
     
     
         3 . The sound signal processing device according to  claim 1 , wherein
 the behavior information acquisition unit is a steering information acquisition unit that acquires steering information about the mobile apparatus, and   the sound control unit performs sound field control by controlling the virtual sound source positions of the respective separated sound signals obtained from the input sound source, in accordance with the steering information acquired by the steering information acquisition unit.   
     
     
         4 . The sound signal processing device according to  claim 1 , further comprising
 a sensor information acquisition unit that acquires approaching object information about the mobile apparatus,   wherein the sound control unit performs sound field control by controlling the virtual sound source positions of the respective separated sound signals obtained from the input sound source, in accordance with the approaching object information acquired by the sensor information acquisition unit.   
     
     
         5 . The sound signal processing device according to  claim 1 , wherein
 the sound control unit includes:   a sound source separation unit that receives an input of a sound source, and acquires a plurality of separated sound signals from the input sound source; and   an output signal generation unit that includes delay units and amplification units that receive inputs of the separated sound signals generated by the sound source separation unit, and performs delay processes and amplification processes for the respective speakers and the respective separated sound signals.   
     
     
         6 . The sound signal processing device according to  claim 5 , wherein
 the sound source separation unit generates a sound signal associated with a primary sound source that is a main sound source included in the sound source, and a sound signal associated with an ambient sound source that is not a primary sound source, and   the output signal generation unit performs a delay process and an amplification process for each of the sound signal associated with the primary sound source and the sound signal associated with the ambient sound source, each sound signal having been generated by the sound source separation unit.   
     
     
         7 . The sound signal processing device according to  claim 6 , wherein
 the sound control unit performs sound field control by controlling the respective virtual sound source positions of the primary sound source and the ambient sound source independently of each other, in accordance with a behavior of the mobile apparatus, the primary sound source and the ambient sound source having been obtained from the input sound source.   
     
     
         8 . The sound signal processing device according to  claim 5 , wherein
 the sound source is a stereo sound signal having sound sources of two channels of L and R,   the sound source separation unit generates an L sound signal and an R sound signal that are components of the sound source, a sound signal associated with a primary sound source that is a main sound source included in the sound source, and a sound signal associated with an ambient sound source that is not a primary sound source, and   the output signal generation unit performs a delay process and an amplification process on each of the L sound signal, the R sound signal, the sound signal associated with the primary sound source, and the sound signal associated with the ambient sound source, each sound signal having been generated by the sound source separation unit.   
     
     
         9 . The sound signal processing device according to  claim 8 , wherein
 the sound control unit performs sound field control by controlling the respective virtual sound source positions of an L sound source and an R sound source that are components of the sound source, and the primary sound source and the ambient sound source obtained from the input sound source, independently of one another, in accordance with a behavior of the mobile apparatus.   
     
     
         10 . The sound signal processing device according to  claim 5 , wherein
 the sound source is a stereo sound signal having sound sources of two channels of L and R,   the sound source separation unit generates an L sound signal and an R sound signal that are components of the sound source, a sound signal associated with a primary sound source that is a main sound source included in the sound source, a sound signal that is associated with an ambient L sound source and is obtained by subtracting the sound signal associated with the primary sound source from the L sound signal, and a sound signal that is associated with an ambient R sound source and is obtained by subtracting the sound signal associated with the primary sound source from the R sound signal, and   the output signal generation unit performs a delay process and an amplification process on each of the L sound signal, the R sound signal, the sound signal associated with the primary sound source, the sound signal associated with the ambient L sound source, and the sound signal associated with the ambient R sound signal, each sound signal having been generated by the sound source separation unit.   
     
     
         11 . The sound signal processing device according to  claim 10 , wherein
 the sound control unit performs sound field control by controlling the respective virtual sound source positions of an L sound source and an R sound source that are components of the sound source, and the primary sound source, the ambient L sound source, and the ambient R sound source obtained from the input sound source, independently of one another, in accordance with a behavior of the mobile apparatus.   
     
     
         12 . The sound signal processing device according to  claim 1 , wherein
 the sound control unit performs sound field control to set a sound field that follows a field of view of a driver of the mobile apparatus, the field of view of the driver changing with a behavior of the mobile apparatus.   
     
     
         13 . A mobile apparatus comprising:
 an operation unit that changes a behavior of the mobile apparatus;   a behavior information acquisition unit that acquires behavior information about the mobile apparatus; and   a sound control unit that controls output sounds from speakers disposed at a plurality of different positions in the mobile apparatus,   wherein the sound control unit performs sound field control by controlling virtual sound source positions of respective separated sound signals obtained from an input sound source, in accordance with information acquired by the behavior information acquisition unit.   
     
     
         14 . The mobile apparatus according to  claim 13 , wherein
 the operation unit is an accelerator that changes a velocity of the mobile apparatus,   the behavior information acquisition unit is a velocity information acquisition unit that acquires velocity information about the mobile apparatus, and   the sound control unit performs sound field control by controlling the virtual sound source positions of the respective separated sound signals obtained from the input sound source, in accordance with the velocity information acquired by the velocity information acquisition unit.   
     
     
         15 . The mobile apparatus according to  claim 13 , wherein
 the operation unit is a steering wheel that changes a traveling direction of the mobile apparatus,   the behavior information acquisition unit is a steering information acquisition unit that acquires steering information about the mobile apparatus, and   the sound control unit performs sound field control by controlling the virtual sound source positions of the respective separated sound signals obtained from the input sound source, in accordance with the steering information acquired by the steering information acquisition unit.   
     
     
         16 . The mobile apparatus according to  claim 13 , further comprising
 a sensor that acquires approaching object information about the mobile apparatus,   wherein the sound control unit performs sound field control by controlling the virtual sound source positions of the respective separated sound signals obtained from the input sound source, in accordance with the approaching object information acquired by the sensor.   
     
     
         17 . A sound signal processing method implemented in a sound signal processing device, the sound signal processing method comprising:
 a behavior information acquiring step in which a behavior information acquisition unit acquires behavior information about a mobile apparatus; and   a sound controlling step in which a sound control unit controls output sounds from speakers disposed at a plurality of different positions in the mobile apparatus,   wherein the sound controlling step includes performing sound field control by controlling a virtual sound source position of each separated sound signal obtained from an input sound source, in accordance with the behavior information acquired in the behavior information acquiring step.   
     
     
         18 . A sound signal processing method implemented in a mobile apparatus, the sound signal processing method comprising:
 a step in which a sensor detects presence of an object approaching the mobile apparatus; and   a sound controlling step in which a sound control unit controls output sounds from speakers disposed at a plurality of different positions in the mobile apparatus,   wherein the sound controlling step includes performing sound field control by controlling a virtual sound source position of each separated sound signals obtained from an input sound source, in accordance with approaching object presence information acquired by the sensor.   
     
     
         19 . A program for causing a sound signal processing device to perform sound signal processing including:
 a behavior information acquiring step in which a behavior information acquisition unit is made to acquire behavior information about a mobile apparatus; and   a sound controlling step in which a sound control unit is made to control output sounds from speakers disposed at a plurality of different positions in the mobile apparatus,   wherein the sound controlling step includes causing the sound control unit to perform sound field control by controlling a virtual sound source position of each separated sound signal obtained from an input sound source, in accordance with the behavior information acquired in the behavior information acquiring step.